Re: [Isis-wg] Question about Purge LSP in RFC 1142
Dave Katz <dkatz@juniper.net> Fri, 19 October 2007 14:33 UTC
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From: Dave Katz <dkatz@juniper.net>
Subject: Re: [Isis-wg] Question about Purge LSP in RFC 1142
Date: Fri, 19 Oct 2007 08:32:15 -0600
To: mike shand <mshand@cisco.com>
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Cc: "Theodore.Wang" <theodore.wang@gmail.com>, isis-wg@ietf.org
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On Oct 19, 2007, at 5:34 AM, mike shand wrote: > >> >> But in fact, in a huge network, it is hard to locate the router >> that generate the Purge LSP, and which is the situation I'm >> facing. A Corrupted LSP Storm is happening in the network and it >> lacks a efficient way to troubleshooting because we can only use >> "ignore checksum error" on every router to find the one that >> flooded the Purge LSP. > It is for this reason (the purge storm) that the specification was > changed! Yep. There was a busted UUnet link in Texas, I believe, back in around '96, that was corrupting packets but delivering them with valid datalink checksums. This caused every LSP crossing the link (which is, by definition, eventually *every* LSP) to be purged and reflooded. And purged and reflooded. It was quite spectacular, if rather unpleasant. I don't quite remember how we found the bad link; probably saw some other error indications at the ends. A knob was added rather quickly. --Dave _______________________________________________ Isis-wg mailing list Isis-wg@ietf.org https://www1.ietf.org/mailman/listinfo/isis-wg
- [Isis-wg] Question about Purge LSP in RFC 1142 Theodore.Wang
- Re: [Isis-wg] Question about Purge LSP in RFC 1142 mike shand
- RE: [Isis-wg] Question about Purge LSP in RFC 1142 Manav Bhatia
- Re: [Isis-wg] Question about Purge LSP in RFC 1142 Dave Katz
- Re: [Isis-wg] Question about Purge LSP in RFC 1142 Hannes Gredler
- RE: [Isis-wg] Question about Purge LSP in RFC 1142 Les Ginsberg (ginsberg)
- Re: [Isis-wg] Question about Purge LSP in RFC 1142 mike shand